FR2654753A1 - APPARATUS FOR CONTINUOUS THERMAL TREATMENT OF TEXTILE YARNS. - Google Patents

Abstract

The invention relates to an apparatus for a continuous heat treatment of textile yarns, which can be introduced into a yarn treatment chamber and discharged therefrom by means of conveyor belts, in which chamber superheated water vapor is channeled. through the wires in the form of a circulating flow with the aid of flow guide means. The yarn processing chamber 10 operates under atmospheric pressure as a so-called open system; several threads 1 are deposited in the form of loops 8 on perforated conveyor belts 5; the flow of steam is channeled so that it flows from the top through the threads and permeable areas of the conveyor belts 5 which, in order to avoid the formation of condensation water, are made in the form of Crosslinked non-metallic strips, preferably coated plastic. Application to the treatment of carpet yarns.

Description

The present invention relates to an apparatus for a treatment

  continuous heat transfer of textile yarns which are introduced into a yarn processing chamber and discharged therefrom by means of conveyor belts, in which chamber superheated steam is channeled through the yarns in the form of a flow of traffic using

flow guiding means.

  Apparatus of this type is known from U.S. Patent No. 4,513,514. In this device, there is provided for each individual wire a so-called winding stem, which is respectively equipped with four narrow conveyor belts in rotation, the different textile threads being wound in the form of controlled loops around the winding stem and the conveyor belts. This yarn guiding mode obviously avoids that the yarns come into contact with a steel strip, such as that frequently used for processing chambers of textile yarns, and consequently with condensation water residues, which form as a result of the cooling on the outside of the wire treatment chamber, necessarily on a metal conveyor belt This however poses a problem when the wires to be fixed have been mechanically pressed beforehand, for example in a crimping device With the mode known loop guide, the existing crimp in the textile yarn is flattened,

  which reduces the quality of the fixed textile threads.

  For this reason, in practice, so-called closed systems in which the conveyor belts do not penetrate into and out of the wire processing chamber are used for fastening mechanically pressed wires. used a perforated steel conveyor belt on which the yarns are deposited in the form of loops The saturated steam under pressure which is used as a treatment agent crosses the strip

  conveyor and the wires deposited thereon.

  However, saturated steam has proved to be

for fixing such wires.

  In other devices for treating textile threads (patent application FR-25 84 429), a steam chamber is also already used in which the so-called open system is used and which is traversed by a conveyor belt. In this case, the treatment of the yarns is also carried out by means of saturated steam, but nevertheless necessarily under atmospheric pressure. A conventional perforated steel strip is used, which is guided in the form of a roof on a roll and which receives steam in from a roof-shaped steam channeling device which is located underneath For the fixation of mechanically strained wires, this device is not suitable.

  The object of the invention is to arrange a device

  of the type defined above so that relatively complicated guidance is avoided on winding brackets. In an apparatus of the aforementioned type, the problem is solved according to the invention in that each wire is deposited in the form of loops on an associated conveyor belt, which is constituted by a non-metallic cross-linked strip through which flow can pass and the flow channel means are arranged in the form of water vapor inlet devices

  which are placed above the reticulated bands.

  Other than in known installations, superheated steam is used instead of saturated steam for fixing in crimping plants. The closed type wire processing systems which have been used until now are replaced in accordance with the present invention. In addition, the perforated conveyor belt of known type is no longer made of metal.

  because metals cause, because of their conductivity,

  temperature, the steel strip cools outside the wire treatment chamber and carries with it drops of water which have a

  disruptive effect on the fixing of the textile thread.

  For this reason, according to the invention, a conveyor belt is used which is made of a non-metallic material and which is furthermore made in the form of a net advantageously woven or braided, which is traversed particularly well by the agent. In this way, it avoids the guiding

on a winding stem.

  The net-shaped non-metallic conveyor belt, made flexible unlike the prior art steel conveyor belts, is guided mechanically and laterally along its entire length; the different conveyor belts are then guided in a straight line through the yarn processing chamber. To obtain a high flow velocity through the yarns, the flow channeling means have a cross section.

  crossing to the transpor-

  Advantageously, in this respect, before each conveyor belt, there is provided a flow channeling means between which the conveyor belt is advantageously interposed with a perforated plate, which uniformizes the temperature on the conveyor belt.

  the width of the treatment chamber.

  According to another particularity of the invention, the conveyor belt is associated respectively with the inlet and the outlet of the son treatment chamber with a thermal stabilizer which operates according to the principle of the countercurrent Thus, the efficiency of the installation is increased because the exhaust of superheated steam is prevented to a large extent. The perforated, non-metallic net-shaped conveyor belt is advantageously made in the form of a strip of coated plastic,

  which is thus in the form of a transpor-

  endless machine whose ends are connected to

non-metallic means.

  According to other peculiarities of the apparatus

  According to the invention: The water vapor inlet devices are arranged in the form of guide channels having a decreasing flow passage section.

  towards the reticulated band.

  Each director channel is associated with

  flow channeling means.

  The main channels are equipped with

  guides for reticulated bands.

  Other features and advantages of the invention will be highlighted, in the following

  of the description, given by way of nonlimiting example

  with reference to the accompanying drawings in which: Figure 1 shows a crimping installation of textile yarns, which uses a yarn processing chamber according to the invention, Figure 2 is a longitudinal sectional view of the yarn processing chamber. 3 is a sectional view of the wire processing chamber of FIG. 2, FIG. 4 is an enlarged partial elevational view of FIG. 3 to show the flow channeling means. 5 is an elevational view similar to FIG. 4, in the zone of the thermal stabilizer provided at the outlet of the son treatment chamber, and FIG. 6 is a longitudinal sectional view.

  made in the area of the thermal stabilizer.

  The crimping installation of textile threads of FIG. 1 comprises, for the treatment of a textile thread 1, which passes through the installation in the direction of the arrow A, a rack 2 provided with feed rolls 3 for the different son 1 to be treated With each wire 1 is associated a device 4 for depositing loops, in an ordered manner or not, on a respective perforated conveyor belt The various conveyor belts 5 consist of a non-metallic cross-linked strip and are guided by means of the return rollers 6 and 7, one of which, for example the roll 6, is driven The son 1 are located in the form of loops 8, ordered or not, on the various perforated conveyor belts 5 The conveyor belts 5 move

  in the direction of arrow B through the installation

  They are returned in the direction of the arrow E. The son 1 deposited in the form of loops 8 on the conveyor belts 5 initially pass through a crimping installation 9 where they are mechanically crushed in a known manner. stride 1 are subject to fixing in a room

  treatment 10 under the action of superheated steam.

  It is provided downstream of the wire processing chamber 10, which is called a wire cooler 11, after which the fixed wires 12 are removed, in the direction of the arrow C, from the different conveyor belts 5 and are fed, in the direction

  from arrow D to a winding machine 13.

  The elevation views of Figures 2 and 3 show the wire processing chambers 10 in which the mechanically crimped wires 1 are expanded and fixed. The perforated conveyor belts through the processing chamber 10 can be seen in the figures. in the direction of the arrow B and on which the son 1 are deposited in the form of loops 8, and the strands 14 returning in the direction of the arrow E respectively before and after the fixing chamber itself 16 of the These primary zones and 17 serve to improve the tightness of the air conditioning chambers of wires 10, in their longitudinal direction and at the places where the conveyor belt

  5 is guided at the entrance or exit.

  The primary zones 15 and 17 are connected to corresponding steam evacuation pipes 18, 19. Below the conveyor belts 5, an electric heating device 20 is provided which produces an overheating of the steam.

  penetrating through a main steam tube 21.

  Below the conveyor belts is disposed, in the longitudinal direction of the wire processing plant, the main pipe

  steam 21 which provides the supply of steam.

  By means of a fan 22 driven by a motor 23 (FIG. 3), the superheated steam is propelled in a circular flow path. The loops 8 located on the conveyor terminals 5 are traversed by the flow from the top, the different conveyor belts 5 being associated with guide channels 24 for the flow of steam, these channels being described in more detail in the following

using Figure 4.

  In FIG. 4, it is possible to see, above a perforated conveyor belt 5 constituted by a textile thread, a pipe member which is arranged in the guide channel 24 and which consists of plates 25 placed parallel to each other. the side of the other in the direction of flow and between which channels 26 are formed Above and below the flow channel member 25, 26, there is provided each time a perforated plate 27, 28 which uniformizes the flow, and therefore the temperature, over the working width of the wire processing chamber 10 From the lower perforated plate 28 from the plates 29, directed obliquely inwards, to the longitudinal edges side of the conveyor belt 5, the inclination of the plates 29 being adjusted so that the flow passage section decreases towards the corresponding conveyor belt 5 in such a way that

  that the flow is accelerated in this zone.

  These sheets 29 are provided, in the region of the conveyor belts 5, with guides 31 in the form of grooves

  for conveyor belts Below the lower strand

  14 of each conveyor belt 5, the water vapor is discharged acceleratedly from the guide channel 24 by means of a discharge slot 30. Each conveyor belt 5 is guided laterally along its length by means of the mechanical guides 31, which provide guidance in a straight line through the guide channels 24 and the son air conditioning chamber 10. In the region of the primary output zone 17, there is provided in each channel 24 a thermal son stabilizer 33 , which was

  shown in longitudinal section in Figure 6.

  A comparable thermal stabilizer is also provided in a region of the primary input area

  Figure 5 shows the corresponding cross-section

  in the area of the thermal stabilizer It can be seen that, in the region of the primary zones 15 and 17, the vapor, flowing from the top, is deflected so that it then flows, from below and according to the countercurrent principle, the perforations existing in the corresponding conveyor belt 5 Thus, a certain tightness is obtained so that cold air can not penetrate from the outside into the son treatment chamber. The thermal stabilizer 33 comprises a perforated sheet, above which the lower strand 14 of the conveyor belt 5 is guided at a short distance. The primary zones 15 and 17 are disposed outside the insulation 34 of the son treatment chamber 10. area of the outlet opening 35 and also in the area of the unrepresented inlet opening there is further provided narrow plates 36 and 37 which must make difficult

  the penetration of cold outside air.

  With the apparatus according to the invention, yarns which have been mechanically expanded in open systems can be subjected to fixing with superheated steam.

  not influenced by the increase in pressure

  conventionally with saturated steam, so that the quality of the yarns is improved. The existing flow channeling means make it possible to obtain high flow speeds through the yarns, the additional perforated sheets enabling

  precise control of temperature and flow.

  To avoid a condensate, a net is used

of a non-metallic material.

Claims (1)

1 Apparatus for a continuous heat treatment of textile yarns, which can be introduced into a son-processing chamber and removed from it by means of conveyor belts, in which chamber superheated steam is channeled through the yarn in the form of a circulation flow by means of flow guiding means, characterized in that each yarn (1) is deposited in the form of loops (8) on an associated conveyor belt, which consists of a non-metallic crosslinked web capable of being traversed by a flow and in that the flow channeling means (25, 26) are arranged in the form of water vapor admission devices which are placed above the webs crosslinked. 2 Apparatus according to claim 1, characterized in that each crosslinked strip (5) is guided laterally over its entire length. 3 Apparatus according to one of claims 1 or 2, characterized in that each cross-linked strip (5) is guided in a straight line through the form of son treatment (10). Apparatus according to one of claims 1 to 3, characterized in that the intake devices are arranged in the form of guide channels (24) having a decreasing flow section in the direction of the cross-linked strip (5). Apparatus according to claim 4, characterized in that each director channel (24) is associated with a flow channel means (25, 26) behind which there is provided a perforated plate (28) disposed in front of the cross-linked strip (5). Apparatus according to claims 2 to 5, characterized in that the guide channels (24) are provided with guides (31) for the cross-linked strips (5). Apparatus according to one of Claims 1 to 6, characterized in that each cross-linked strip (85) is associated respectively with its inlet (15) in the wire treatment chamber (10) and at its outlet (17) with a thermal stabilizer. (33) which operates on the principle of countercurrent. 8 Apparatus according to one of claims 1 to 7, characterized in that the crosslinked strip (5) is a strip of plastic coated material. Apparatus according to one of the claims   1 to 8, characterized in that the cross-linked strip (5) is an endless terminal whose ends are connected to non-metallic means.